[jira] [Created] (ARROW-10939) [C#][FlightRPC] incompatible with java client for empty record batches

["Alexander (Jira)" <ji...@apache.org>]

Alexander created ARROW-10939:
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             Summary: [C#][FlightRPC] incompatible with java client for empty record batches
                 Key: ARROW-10939
                 URL: https://issues.apache.org/jira/browse/ARROW-10939
             Project: Apache Arrow
          Issue Type: Bug
          Components: C#, FlightRPC
            Reporter: Alexander


An error has been found when one sends an empty record batch from C# server and tries to read it with the java client.

From investigation the java client requires the protobuf tags to be sent in the message even though it is empty. Java code can be seen here:

[https://github.com/apache/arrow/blob/master/java/flight/flight-core/src/main/java/org/apache/arrow/flight/ArrowMessage.java]

Normal functionality of gRPC is to exclude the entire tag if an object is empty, example code from generated csharp:

if (DataBody.Length != 0) {
 output.WriteRawTag(194, 62);
 output.WriteBytes(DataBody);
 }

To fix this so the csharp version is compatible with the java client requires a non empty flight data body must be sent or at least the tag of the body.



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